OK, here's one for the moron files... When I bought the truck, I took the guy's word for it that it was a 350. But I was thinking about it, and it could be a 305, 350, or even a diesel for all I know (of course using reg. gas probably rules out the diesel part.) But you know what I mean, I can't tell by just looking in there. Are there any significant markings or physical differences that would give away the engine size? Boy, I feel like a retard, but hey I gotta figure it out some way...thanks.